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Post by mastertech on Aug 26, 2013 16:27:59 GMT -5
So the board is removed and all 5 regulators show short when testing with DMM on diode scale?
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Post by Michael on Aug 26, 2013 16:37:48 GMT -5
FYI, Going back and testing the D301 with one leg lifted. I get no reading on it! (OL).
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Post by Michael on Aug 26, 2013 16:40:20 GMT -5
Yes, I already had the board removed and all 5 regulators show 0.000 when I test them individually on their legs.
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Post by mastertech on Aug 26, 2013 16:56:48 GMT -5
FYI, Going back and testing the D301 with one leg lifted. I get no reading on it! (OL). What do you mean by no reading? How are you testing? |
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Post by mastertech on Aug 26, 2013 16:58:15 GMT -5
Yes, I already had the board removed and all 5 regulators show 0.000 when I test them individually on their legs. I'm surprised that they would all be shorted. What happened to this unit that it stopped working? |
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Post by Michael on Aug 26, 2013 17:10:25 GMT -5
FYI, Going back and testing the D301 with one leg lifted. I get no reading on it! (OL). What do you mean by no reading? How are you testing? I set the DMM on Diode measurement just as I am measuring continuity. It shows no measurement. (Open Line) |
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Post by Michael on Aug 26, 2013 17:12:55 GMT -5
Yes, I already had the board removed and all 5 regulators show 0.000 when I test them individually on their legs. I'm surprised that they would all be shorted. What happened to this unit that it stopped working? This unit was running and all of the sudden turned off and never came back on again!! |
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Post by Michael on Aug 26, 2013 17:15:58 GMT -5
If this is too frustrating and time consuming for you, I can have a professional look at here.I dont have an extensive knowledge about electronics and testing. Perhaps I am doing something wrong her!!
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Post by mastertech on Aug 26, 2013 17:57:25 GMT -5
What do you mean by no reading? How are you testing? I set the DMM on Diode measurement just as I am measuring continuity. It shows no measurement. (Open Line) Is that no measurement in both directions? Are you switching leeds and testing both ways. It should show open in 1 direction and some flow in the other. |
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Post by mastertech on Aug 26, 2013 18:02:43 GMT -5
If this is too frustrating and time consuming for you, I can have a professional look at here.I dont have an extensive knowledge about electronics and testing. Perhaps I am doing something wrong her!! I have no problem continuing but it's up to you. You are doing fine so far. I would guess your testing them properly. Something is definitely causing excessive draw on that transformer. Just odd they would all blow unless it took a surge, like lightning or something. Do you have another fuse to replace F302? |
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Post by Michael on Aug 27, 2013 1:16:35 GMT -5
I have to buy a few from Radio Shack tomorrow . Lets continue and see where it goes... Now I'm curious to fing out what went wrong with this unit. There was no surge or lightning at the time it went out. I had it connected to a pretty good surge protector along with other electronic equipment which all are working fine. Please let me know what I should look into next...
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Post by mastertech on Aug 27, 2013 9:46:06 GMT -5
What I would like to do is have you replace that fuse and see if it still blows with that regulator board removed. But we need to check a couple things first. Back to that diode (D301). How did it finally test. Did it show flow in 1 direction and none in the other? Do you know how to properly test a diode?
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Post by Michael on Aug 27, 2013 10:08:52 GMT -5
When I tested it, it did not show flow in any direction. If you don't mind briefly explain the testing procedure of diode to make sure I'm doing it correctly.
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Post by mastertech on Aug 27, 2013 10:25:01 GMT -5
With 1 leg removed, look for the dark band near 1 end on the diode. With DMM on diode test, Neg probe on end with band and pos probe on opposite end, meter should have a reading, possibly .550 or similar. Then switching probes, pos probe on end with band and neg probe on opposite end there should be no reading, as in open.
I'm guessing your meter is working properly since in your original post you indicated you tested Q301 and got .729 in 1 test and .615 in another, which would probably be correct.
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Post by Michael on Aug 27, 2013 10:42:02 GMT -5
I am still getting no reading, as if there is no contact between the probes (OL).
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